Dust arrester



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G. C. FATSCHER DUST ARRESTER Filed Oct. 23. 1923 2 Sheets-Sheet 1 NVENTOR //l Geom-re CI Hanse/ff@ CG r/ ATTORNEYS Hume 3 1924..

G. c. FATSCHER! DUST ARRESTER Filed Oct. 23. 1923 2 Sheets-5heet INVENTOR GEORGE C, Finse/1ER ATTORN EYS Patented dune 3 1924i.

tueur sr earns-ir GEORG-E C. FATSCHER, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO THE NEW HAVEN SAND BLAST COID/IIANY, OF HAVEN, CONNECTICUT, A CORJPORATION F CONNECTICUT.

DUST ESTER. l

Application led October 23, 1923. Serial Eo. 670,32*?.`

T o all whom t may concern.' Be it known that I, GEORGE C. FATSCHER, a citizen of the United States of America, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful .Improvements in Dust Arresters, of which the iollowing is aspecification.

My invention relates to dust arresters, and particularly to apparatus for removing from an exhaust draft the entrained dust particles. The present invention presents certain improvements in construction and operation over those oit my prior Patent No. 1,316,888, September 23, 1919, as will be hereinafter described or made clear by the accompanying drawings, in which- Fig. 1 is a vertical section through an arrester in which my improvements are embodied in one form;

Fig. 2 is a section on the line 2-2, Fig. 1; Fig. 3 is a broken plan view of Fig. 1; Fig. 4 is an enlarged, broken, verticalsection illustrating the ilter bag construction and mounting; and

Fig. 5 is an inverted plan of the bottom vbag 'frame showing my improved anchorage jfor the bag mouths and a filler block.

The arrester comprises an air-tight steel housing 15 divided into inlet and exhaust chambers, 16 and 17 respectively, by a wooden partition and stationary bag frame 18 which extends across the lower portion' v of the housing and is bolted to side and intermediate angle irons 19. An inlet port 2O opens to the chamber 16 below the partition and is adapted for connection to the inlet duct: 21. An outlet port 22, at the upper portion of the chamber 17, opens to the exhaust duct/#23, which leads to an exhaust fan (not shown). The bottom of the inlet chamber is shaped to form one or more hop'- pers 2li which receive thc dust caught by the arrester bags and subsequently discharged to the. hoppers.

The partition 18 is provided with a series of parallel slots 25. into which project the lower and open ends of the filter bags 26.

The mouths of the bags are secured in rabbets 27 formed along the lower margins of the slots 25. As a simple and etl'ective holding means. l provide for each opening a pair of wire rods 28 each offset at one end 29, the

length of the rods 28 substantially corresponding to the length of the slots 25, and the offsetends 29 substantially corresponding tothe width of the slots 25. The ar rangement of the rods in adjusted position with their offset ends 29 at the opposite ends of the vslot 25, is shown in Fig. 5. A continuous loop to accommodate the rods is -formed at the bag mouth, by stitching down der proper conditions a one-piece stretching l frame may be used at the mouth of the bag, but I prefer the two-piece construction rshown since it not only accommodates itself to variations in size oi: the opening 25, and to slight variations in dimension of the bag,

but it also insures iirmer clamping in the y rabbets 27 by the clins 30. and thus a stronger grip on the Jfabric. Their effect, in any oase, is to hold the mouth of the bag open and to anchor it firmly at the openings in the lined frame 18.

The upper or closed end of the bag is supported by rods 31 engaged in loops 32 formed in the manner described in my patent above mentioned. kThe rods 31 are engaged by j clamps 33' with associated bolts 34 attached to the bars 35 extending transversely of' the bag group and constituting portion of the doating, top-suspension frame. The oonstruction of the floating trame 'varies with the number oi bags in each :traine group.

.lis shown there are two bars 35 for each bag group, united by an intermediate and centrally located cross bar 36. The frame has a floating suspension through spring? 37 from angle irons 38 on the root of the ousing 15. `Centrally arranged on the cross bar 36 is mounted a pneumatic vibrator 3@ provided with a connection 40 for attach ment thereto of a `dexible pneumatic preseure (indicated in dotted lines, Fig.

iid

1). The details of construction of the vibrator 39 are not shown inasmuch as they constitute no part of my invention per se. lt suffices to state that it comprises a relatively heavy slug which, when in operation, imparts hammer blows alternatively to the opposite ends of the casing 39. (See patent to Pickop No. 1,336,921.) y

It will be noted that the suspension frame and associated suspension springs afford a floating bag support which carries, as a unitary, self-contained element, the vibrator 39. The importance of this structure will be appreciated when it is considered that the dust gathered by the bags in the course of several hours run, without cleaning, isfrequently so heavy as to cause the springs to elongate and thus let the suspension frame down so far that the usual shaking cams fail to operate, or act ineciently.. The present vibrator, .mounted directly on the suspension frame, follows the latter as it sinks and operates with perfect efiiciency re-v gardless of the added weight of the dust accumulation in the bags.

Extending between the bag frame 18 and the top supporting rods 81, are diagonally arranged beater wires el lying against the opposite faces of the bags 26 and preferably provided intermediate their length with springs 42.

lin order to prevent bellying of the body the bags under the suction of the exhaust, and the consequent danger of contact between' the sides of adjacent bags, I stitch` the sides of each bag together by vertical courses a3, thus forming in effect a series ofyertical channels extending from la point slightly spaced from the intake mouth 44 of the bag to a point spaced from the upper portion of the bag.

ln order to obtain access to the interlf of the dust chamber for inspection and pair, I provide appropriate door openings L15 and 46 to the interior of the casing. l also provide filler blocks 47- which may be temporarily inserted in the partition open ings 25 to plug the latter, should it become necessary tocut out a defective bag. The operation of the arrester may then be continued without further interruption.

The action of the dust arrester is as foliows. When the exhaust fan is started the air is drawn through pipe 23 from chamber 17 and into the latter through the bags from the chamber 16, to which the inlet port 2O opens. Upon the entrance of air into the relative quiet of chamber 16, the heavier entrained particles fall into the hoppers 24, while the lighter particles are carried with the air through the openings 25 Vin the bag frame 18 to the interior of the bags 26. :The particles are caught by the latter, while the clean airpasses through the bags to the chamber 17 and them@ $0 nascose the exhaust fan, which either dlscharges the air or returns it to the chamber whence it was derived, through the pipe 21. When the exhaust fan is operating, the bags 26 are maintained quiet. When it is desired to clean them, the exhaust fan is stopped, and air under pressure is admitted to the pneumatic impact device 39. The slug therein 1s at once reciprocated and imparts a series of sharp impact blows in opposite directions tothe suspension frame -36. Inasmuch as the latteris hung on the springs 37, each downward impact of the slug drives the suspension frame downward, thus relaxing the tension 26 upon the bag fabric and placing the springs 37 under additional stress. immediately following the downward stroke, the plunger is thrown upward by the pneumatic pressure. As it rises, the springs 37 contract and again tension the bags 26 with a sna mented by t e upward impact of the pneumatic slug against the top of its casing 38. The combined action of the impact plunger and the springs, which alternatel slack and snap the bag fabric, very e ectively frees the adherent dust lparticles therefrom. The dust falls down through the open bottoms of the bags into the hoppers 24, thus leaving the bags clean and ready to eiciently perform their function when the exhaust fan is again set in operation.

lThe freeing of the dust particles from the bag fabricI is augmented by the beater wires 41, which, during the vibration of the suspension frame 35-36, are alternatively slacked and tightened, and thus beat the outer faces of the bags and help to loosen the dust particles from the bag walls.

The improvements above set forth greatly increase the efficiency of the apparatus of my prior patent, and l: claim as my inven- 'tionl. In a dust arrester, a closed casing, a xed partition subdividing the interior of said casing into upper and lower chambers, said partition being apertured by a slot rabbeted at its lower edge, an inverted bag suspended in the upper chamber by its l closed upper end and having its mouth extending into the slot in the partition, a bag mouth frame comprising complementa wire rods, each having one end offset to ai'- ford a bent end adapted to lie in the rabbeted end of the slot in the partition, the rods being so arranged that their respective end bends lie in the rabbets at opposite ends of the slot, and means secured to the lower face of the partition to clamp the bag mouth and its associated frame inthe rabbet.

2. ln a dust arrester, a bag, upper and lower frames for holding the same in position, one of said frames being spring suported, together with a self-contained riratory impact member carried by said action, which effect is aug-v ist spring-supported frame, and serving, upon actuation, to alternately stress and relieve the supporting springs.

3. In a dust arrester, a bag, upper and lower frames for holding the same in position, one of said frames being spring supported, together'with a self-contained vibratory impact member carried by said spring- 'supported frame, and serving upon actuation to impart successive blows tothe springsupported frame.

4. In a dust arrester, a bag, upper` and lower frames for holding the same in position, one of said frames being spring supl ported, together with a self-containedvvibratory impact member carried *by said springsupported frame, and serving upon actuation to impart successive blows in opposite directions to the spring-supported frame.

5. In a dust arrester, a series of bags, a fixed frame holding said bags open at their lower ends, a spring-suspended frame supporting the closed upper ends of the bags and. normally holding said bags taut, in combination with a reciprocating member carried by the spring suspended frame and adapted to impart hammer blows in opposite directions to said spring-suspended immo, and thus to render the bag fabric alternately slack and taut to free dust particles therefrom. y

6. In a dust arrester, a series of bags, a. fixed frame holding said bags open at their lower ends, a suspension frame engaging said bags at their closed upper-ends, springs supporting said suspension frame and normally stressed to hold the bags taut, and a self-contained pneumatic vibrator mounted on said frame and adapted to impart hammer blows in opposite directions to said frame, and thus, in cooperation with the supporting springs, to cause the ba to become alternately slack and taut to ree dust particles therefrom.

7. In a dust arrester, a casing, filter bags within the casing, a fioating suspension frame for the bags, to ether with a pneumatic vibrator carried y the frame, and a iexible pneumatic pressure hose entering the casing and connected to the vibrator.

In testimony whereof I have signed my name to this specification.

GEORGE C. FATSGmR. 

